Daily Report for 15th January 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.1 °C (-3.1) 07:14 4.9 °C (+1.8) 7.8 °C (+4.8), 2011 -2.7 °C (-5.7), 2024
Maximum Temperature 6.1 °C (-1.7) 13:53 9.7 °C (+1.9) 12.3 °C (+4.5), 2020 1.6 °C (-6.2), 2013
Mean Temperature 2.4 °C (-2.4) 7.3 °C (+1.9) 10.3 °C, 2011 -0.1 °C, 2024
Minimum Humidity 57% 15:07 67% 98%, 2010 53%, 2015
Maximum Humidity 92% 09:28 91% 98%, 2010 83%, 2016
Mean Humidity 79% 79% 98%, 2010 74%, 2015
Minimum Pressure 1024 hPa 19:31 1017 hPa 1026 hPa, 2021 987 hPa, 2015
Maximum Pressure 1027 hPa 06:01 1025 hPa 1033 hPa, 2021 996 hPa, 2015
Mean Pressure 1026 hPa 1021 hPa 1030 hPa, 2021 990 hPa, 2015
Mean Wind Speed 3.1 mph (-2.1) 6.0 mph (+0.8) 10.8 mph, 2015 0.7 mph, 2021
Maximum Wind Speed 12.1 mph 15.0 mph 28.6 mph, 2020 6.4 mph, 2022
Maximum Gust 15.4 mph 14:27 21.3 mph 42.6 mph, 2020 9.1 mph, 2022
Mean Wind Direction ESE
Rainfall 0.0 mm 26.5 mm (93%) 9.1 mm, 2020
Maximum Hourly Rain n/a 3.1, 2020
Maximum 10-min Rain n/a 2, 2018
Maximum Rain Rate n/a 66, 2018
Minimum Dew Point -2.3 °C 15:08 1.2 °C 5.6 °C, 2011 -6.1 °C, 2024
Maximum Dew Point 1.4 °C 11:17 7.0 °C 10.3 °C, 2020 -0.9 °C, 2024
Mean Dew Point -1.0 °C 3.9 °C 8.6 °C, 2014 -3.5 °C, 2024
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.1 °C 07:13 5.7 °C 7.8 °C, 2011 -0.9 °C, 2024
Day Maximum (09-21) 6.1 °C 13:52 9.4 °C 11.2 °C, 2011 1.6 °C, 2013
Max 10m Temp Rise 0.5 °C 11:46 0.3 °C 0.5 °C, 2012 0.2 °C, 2011
Max 1hr Temp Rise 1.8 °C 11:49 1.1 °C 1.9 °C, 2021 0.5 °C, 2015
Max 1hr Hum Rise 5% 16:02 6% 8%, 2016 0%, 2010
Max 10m Temp Fall 0.3 °C 04:56 0.4 °C 1.2 °C, 2020 0.2 °C, 2010
Max 1hr Temp Fall 1.0 °C 16:20 1.3 °C 3.1 °C, 2020 0.4 °C, 2011
Max 1hr Hum Fall 18% 12:34 9% 18%, 2012 0%, 2010
Max 10m Wind Speed 8.8 mph 14:42 10.0 mph 20.3 mph, 2020 4.8 mph, 2022
Minimum Feels-like -2.0 °C 08:13 2.1 °C 4.3 °C, 2011 -6.8 °C, 2024
Maximum Feels-like 5.0 °C 14:14 9.7 °C 13.7 °C, 2020 0.9 °C, 2024
Mean Feels-like 1.1 °C 6.0 °C 9.9 °C, 2011 -3.2 °C, 2024
Air-frost Hrs 0.1 hrs 0.7 hrs 14 hrs, 2024 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.2 °C (+1.4) 4.8 °C (+0.1) 8.8 °C (+4.0), 2017 2.0 °C (-2.8), 2009
Humidity Range 35% 24% 40%, 2015 0%, 2010
Pressure Range 3 hPa 8 hPa 22 hPa, 2020 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7.1 [95%]47 hrs (144%) [43%] 7.45 [100%], 2024 0 [0%], 2010
Wet Hours 019 hrs (57%) [5.1%] 13, 2017 , 2009
Cloud Cover am: Sunny
pm: Mostly Sunny with periods of Sunny
Events Air Frost
Maximum possible sunshine
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 15th January 2012.
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose